*raising hand* I'm a clod. I rarely call out when passing- and I never call out to runners on the trails. Most of them have headphones and don't hear anyway. I used to call out to bikers but after having had two very rude people snip at me- I stopped. I always pass with at least 3 feet or more and go WAY around someone when passing. Hardly any other person calls out here. I can count on one hand how many times someone has called out to me when passing in the last year. Maybe some places it's more common than others.